Plant form

Most plant species at first sight appear very similar since all four organs, the root, stem, leaf and flower, are present in approximately the same form and have the same major functions. The generalized plant form for a dicotyledonous and a monocotyledonous plant can be seen in Figure 5.2 .

Monocotyledonous

Spikelet

Inflorescence-

Leaf blade

Node

Internode with a leaf sheath enclosing the stem inside

Tiller emerging from near ground level

Fibrous roots

Figure 5.2 Generalized plantform: (a) monocotyledon; (b) dicotyledon

Spikelet

Inflorescence-

^Flower bud Flower

Bract Pedicel Stem ( Petiole Lamina

Leaf blade

Node

Midrib

Internode Axillary bud

Internode with a leaf sheath enclosing the stem inside

Tiller emerging from near ground level

Fibrous roots

Taproot

^Flower bud Flower

Bract Pedicel Stem ( Petiole Lamina

Midrib

Internode Axillary bud

Taproot

Axillary Bud Monocotyledon

Figure 5.2 Generalized plantform: (a) monocotyledon; (b) dicotyledon

Monocotyledon And Dicotyledon
Figure 5.3 Germinated seed showing primary and secondary roots growing from lower end of hypocotyl

The development of the root and the stem from the seed is given in detail in Chapter 10. Flowers are the site of sexual reproduction in plants and their external appearance depends principally on the agents of pollination (see Chapters 7 and 10).

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